Python Boolean
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Internal
Overview
A boolean can be True
or False
.
x = True
type(x)
<class 'bool'>
What is True?
The following values evaluate to False
in Python. Everything else evaluates to True
.
- boolean
False
None
- zero integer
0
- zero float
0.0
- empty string
- empty list
[]
- empty tuple
()
- empty dict
{}
- empty set
set()
Operators
OR: | and |=
assert (True | True)
assert (True or True)
assert (True | False)
assert (True or False)
assert (False | True)
assert (False or True)
assert not (False | False)
assert not (False or False)
l = [True, False]
b = False
for e in l:
b |= e
assert b
l = [False, False]
b = False
for e in l:
b |= e
assert not b
Note that +
applied to booleans contest to integers.
AND: & and &=
assert (True & True)
assert (True and True)
assert not (True & False)
assert not (True and False)
assert not (False & True)
assert not (False and True)
assert not (False & False)
assert not (False and False)